21117110 has 16 divisors (see below), whose sum is σ = 43441056. Its totient is φ = 7240128.

The previous prime is 21117097. The next prime is 21117137. The reversal of 21117110 is 1171112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150767 + ... + 150906.

It is an arithmetic number, because the mean of its divisors is an integer number (2715066).

Almost surely, 2^21117110 is an apocalyptic number.

21117110 is an abundant number, since it is smaller than the sum of its proper divisors (22323946).

21117110 is a wasteful number, since it uses less digits than its factorization.

21117110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301687.

The product of its (nonzero) digits is 14, while the sum is 14.

The square root of 21117110 is about 4595.3356787073. The cubic root of 21117110 is about 276.4043205930.

Adding to 21117110 its reverse (1171112), we get a palindrome (22288222).

The spelling of 21117110 in words is "twenty-one million, one hundred seventeen thousand, one hundred ten".